Flashband
Noboby knows how long the plastic stuff will last.
It is tested by the BRE.
I've had a GRP valley gutter for almost 30 years. 10 years
ago, I refitted the roof around it, but the plastic itself
was fine and I kept it (just had to add new sand strips for
pointing onto it).
Nuralite flashing also seems to last quite well....
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